Connected host has failed to respond, but ping and netstat confirm it is up

Hello,

I've installed TightVNC server in my Ubuntu 18.04 server

sudo apt install xfce4 xfce4-goodies
sudo apt install tightvncserver


Set ~/.vnc/xstartup to

#!/bin/bash
xrdb $HOME/.Xresources
startxfce4 &

sudo chmod +x ~/.vnc/xstartup
vncserver


Netstat shows the server is up, and the 5910 port is open and listening

$ sudo netstat -tap | grep 5901
tcp        0      0 0.0.0.0:5901            0.0.0.0:*               LISTEN
     2368/Xtightvnc


Pinging from my machine shows the server is responsive

$ ping 148.251.86.243
PING 148.251.86.243 (148.251.86.243) 56(84) bytes of data.
64 bytes from 148.251.86.243: icmp_seq=1 ttl=64 time=0.022 ms
64 bytes from 148.251.86.243: icmp_seq=2 ttl=64 time=0.033 ms


But setting Remote Host to  148.251.86.243::5901
[image: image.png]

yields "Error in TightVNC Viewer: A connection attempt failed because the
connected party did not properly respond after a period of time, or
established connection failed because connected host has failed to respond."
[image: image.png]

What else should I attempt to debug this issue?

Thank you
Dario

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